Steam-superheater.



No. 683,756 Patented Oct. I, I90l. A. HERING.

STEAM SUPEBHEATER.

(Application filed Jnn. 1S, 1899.) (No Mollema' 2 Sheets-Sheet I.

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A. HERING.

STEAM SUPERHEATER.

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UNTTED STATES ATENT Fries.

AUGUST HER-ING, OF NUREMBERG, GERMANY.

STEAM-SUPERHEATER.

SPECIFICATION forming part of Letters Patent No. 683,756, dated October l, 1901.

Application led January 18, 1899. Serial No. 702,565. (No model.)

To all whom it' may concern:

Be it known that I, AUGUST HERING, civil engineer, a subject of the Emperor of Germany, residing at Nuremberg, in the Empire of Germany, have invented certain new and useful Improvements in or Relating to Steam- Superheaters, of which the following is a specification, and for which a patent has been applied for in Great Britain, No. 17,900, dated August 19, 1898.

This invention has reference to steam-superheaters, and relates more particularly to the type of superheater comprising a series of pipes through which the steam to be superheated is passed, which pipes are adapted to be heated in any suitable manner, usually and conveniently by being exposed either directly or indirectly to the products of combustion flowing from the furnace.

The invention consists in various improvements in superheatersof this character, and comprehends, mainly, means for varying and controlling the lieu' of the steam through the Superheater-pipes.

The invention consists also in the details of construction and combination of parts hereinafter described and claimed.

In the accompanying drawings, Figure lis a vertical sectional elevation of my improved superheater, showing the same applied at the rear end of the boiler. Fig. 2 is a View in the nature of a diagram, showing the manner in which the cylinders of expansion-engines may be advantageously connected with the superheating-pipes to insure a reheating of the superheated steam. Fig. 3 is a transverse sectional elevation on the line a a of Fig. l, on an enlarged scale, showing the collectors in section and the superheater-pipes in elevation. Fig. 4 is a horizontal section through the collector and one of the superheatingpipes, showing how the latter is connected with the collector.

Referring to the drawings, my superheater comprises a series of pipes a', each pipe being bent on itself back and forth to give an eX- tended iiow of steam and said pipes arranged one above the other in a superheating-chamber 1, communicating with a flue 2, through which the products of combustiomfrom the furnace flow. The pipes have their ends extended through the front wall of the superheater-chamber, where they are connected at one side with a collector b and at the other side with a collector c', which collectors are in the form of vertical cylinders extending at the front of the superheating-chamber, outside the same, as shown in Figs. 1 and 2. The ends of the pipes are provided with lianges g', Fig. 4, which abut against Hat surfaces gz, formed on the cylinders, in such manner that the openings in the pipes will register with openings g3 through the sides of the cylinders, which latter are clamped firmly against the ends of the pipes to form a steamtight joint by means of bolts c', extending through lugs on the cylinders and through platesf', formed with openings encircling the pipes at the inner sides of the flanges. From this it will be seen that the connections with the superheater-pipes are wholly outside of the chamber, free from the effects of the products of combustion and easily accessible for repairs.

The collector h is provided near its upper end with a nozzle l for the entrance of the steam to be superheated, while the collector e' is provided near its upper end with a nozzle Z2 for the discharge of the superheated steam, the latter in the ordinary operation of the device liowing from the collectorb through the entire series of pipes and into the collector c', whence it may be conveyed to the desired point for use. In order, however, that the flow of the steam through the pipes may be varied to the end that the device may be employed as a double superheater or the superheated steam. returned for further heating, as is desirable in certain cases,'I mount in the collectors movable partitions h and h2 in the form of steam-tight pistons, provided with stems n', extending through stuffingboXes at the upper ends of the collectors and provided with hand-Wheels o for operating them. When the partitions are in the positions shown in Fig. 3, the series of superheating-pipes is divided equally above and below the partitions, forming a double superheater, and by equal adjustments of the partitions the relative number of pipes on opposite sides of the partitions may be Varied, so that the steam may be caused to traverse a greater or less number of pipes, as desired.

In order to return the superheated steam ICO y passing through the pipes on one side of the heated steam and the latter for `the exit of the same. This reheating of the superheated steam is desirable in connection with the operation of expansion-engines in which the superheated steam from the high-pressure p cylinder instead of being admitted directly to the low-pressure cylinder may be returned to the superheater and reheatcd. In Fig. 4 the connection for effecting this object is shown, where it is seen that the saturated steam enters collector b at its upper end through nozzle Z and flows through the series of pipes above the partitions to collector c', whence it ows in superheated condition through nozzle Z2 and pipe u to high-pressure cylinder S, from which it returns by pipe u to nozzle m in the lower part of collector b', and, flowing through the superheating-pipes below the partitions, is reheated. In its reheated condition it leaves collector c through nozzle lm2 and flows through pipe u2 to the low-pressure cylinder N.

In the case ot' triple-expansion engines the reheated steam from the second cylinder may be passed through the superheating-pipes a third time by providing the collectors with additional partitions h3 and h4, as shown by dotted lines in Fig. 3. The eftect of these additionalpartitions is to divide the superheating-pipes into three groups, so that by the provision of additional entrance and exit openings in the collectors the steam may be passed successively through the three groups of su perheating-pipes.

By means of the movable partitions in the collectors, as shown in Fig. 3, the steam may be caused to traverse the entire series ot' pipes continuously in `alternate directions before beingconducted away to perform its Work. This action would result to a limited degree if the partition 7?/ were adjusted near the upper end of collector b and the partition h2 adjusted near the lower end of its collector, the nozzles Z2 and m2 of collector c being omitted. The steam introduced under these conditions in nozzle Z would traverse the pipes exposed above the partition and enter collector c and would return to the lower part of collector b through the other pipes and find an exit through nozzle m'. The current of steam would therefore pass through two series of pipes in alternate directions. This action could be increased by providing additional partitions in the collectors to cause the steam returning to' the under side of the first partition to flow back again to the opposite collector and then return again to the under side of the second partition.

Having thus described my invention, what I claim is- I. In a steam-superheater, collectors connected respectively with steam supply and take-oft pipes, in combination with a series of su perheating-pipes connecting the collectors, and means for controlling the path of the steam through the collectors and connectingpipes, as described.

2. In a steam-superheater, collectors connected respectively with steam supply and vtake-o pipes, in combination with a series of superheatiug-pipes connecting the collectors, and movable partitions situated in the collectors as described.

3. In a steam-superheater the combination with collectors provided at or near opposite ends with exit and entrance openings, of a series of superheating-pipes connecting said collectors, and partitions situated in said collectors and movable between the said openings therein.

4. In a steam-superheater the combination with two collectors, of steam supply and takeoft pipes connected therewith, a series of steanrsuperheating pipes having their ends connected with the collectors, movable partitions in the form of steam-tight pistons situated in said collectors, and operating-stems xed to said partitions and extending outward through the ends of the collectors.

5. In a steam-superheater the combination with a superheatingchamber, of a lseries of superheating pipes situated therein with their ends extending outward through the chamber, flanges on the ends of said pipes, a collector formed with openings and adjacent flat surfaces for the iianges on the pipes, a plate engaging behind the flanges on said pipes, and means for clamping the plate firmly to the collector.

In witness whereof I have hereunto signed my name, this 5th day of January, 1899, in the presence of two subscribing witnesses.

AUGUST IIERING.

TWitnesses:

OHP.. LANG, J. GG. RAUH. 

